01. Rates of reaction and Collision Theory

What factors affect reaction rates?

Temperature, pressure (gases), light, catalyst, surface area (solids), concentration

What needs to happen for particles to react?

They must collide

What are collisions affected by?

Concentration, pressure and temperature

How does concentration impact collision theory?

Higher concentration = faster reaction -> More reactions in a given volume so greater chance of successful collisions occurring per sec

How does pressure impact collision theory?

Higher pressure = faster reaction -> Particles pushed closer together so greater chance of successful collisions occurring per sec

How does temperature impact collision theory?

Higher temperature = faster reaction -> Particles have more kinetic energy so greater chance of successful collisions occurring per sec

What is the symbol for activation energy?

Ea

What is activation energy?

Minimum energy which a reacting species needs for a reaction to occur

How does higher activation energy affect the rate?

Less molecules will have sufficient energy so rate will be slower

Draw exothermic graph

Yes

Draw endothermic graph

Yes

ΔH of exothermic reactions?

Ea(backward) - Ea(forward)

ΔH of endothermic reactions?

Ea(forward) - Ea(backward)